Updates: I see that SuperSocket.ClientEngine reference has esclamation marks tried to research on that and found that can be downloaded from supersocket, after downloading was not able to find SuperSocket.ClientEngine.dll, how ever there were othere
dlls SuperSocket.Common.dll,SuperSocket.Facility.dll,SuperSocket.Test.dll etc.

Not being sure how you've installed SocketIO4Net.Client (via source code or nuget - recommend via nuget fwiw) - your two dependencies should be SocketI04Net.Client and WebSocket4Net (in your client project references) - these two libraries work together
to give you the Socket.IO flavor in C#.

Have you tried to get the SocketIO4Net TestProject going as a working example?

Could you also include a bit more of the socket.io / node server code - as well as C# client code so I have a better view into your setup?